Yes, so many nice places to live, but a lot to consider for those at the more mature end of the spectrum?! Oz and NZ have many attractions, but the distance as folk have said is huge, and NZ needs extra thought for anyone with medical issues.
Anywhere in Scandinavia is lovely, great standard of living . . .BUT . . .you need LOTS of money, AND if you think winter here is depressing, bear in mind they get so little daylight for several months?!
Holland & Belgium are both well organised, sensible places, easy to get back from if needed --- and they usually quite like us, due to WW2.
Spain is good, but for those who haven't been, the south gets murderously hot in summer! And I mean, in the oven hot! But anywhere like Malaga, Seville, Cordoba etc, in our winter, yes please!
Italy is great, as many have said, and I'd also nominate Portugal, (especially if you like Port !!), another country that quite likes Brits. Austria would be another consideration, some gorgeous towns and cities, if you like art, Vienna has galleries galore, and for scenery, Salzburg is one of the loveliest we've ever seen.
Oh, is anyone planning to wind down their days in say, Botswana, Tanzania (etc), as a volunteer teacher?? Warm weather pretty much guaranteed, probably lower rents, etc?!